Here's an idea: A very simple webserver that hosts a single page on a nonstandard port, that, with the right login, grants server controls for startup, shutdown, and file access, while blockland itself serves the main pages from in-game?
If the webserver was a custom precompiled program, then users wouldn't need to install an entire webserver to control Blockland remotely.
But requiring PHP, a webserver that supports PHP, and a database? That's a bit excessive, especially since over half of the users will want it so that they can run their server while they are away from home. And people with actual servers that could use this probably already have a sufficiently advanced system for these kinds of things.